Test review for ch3 and ch22

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Test review for ch3 and ch22
2013-09-23 21:22:11
review chemistry

Chapter 2 test
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  1. The amount of time it takes for half of a radioactive substance to decay
  2. Alchemists tried to produce this from other materials
  3. atoms of the same element but with different numbers of neutrons are
  4. A high energy type of electromagnetic radiation
    Gamma Ray
  5. means splitting apart
  6. A fast moving electron
    Beta particle.
  7. Identical to the nucleus of a helium atom.
    Alpha particle
  8. Consists of a proton and an electron.
    Hydrogen 1
  9. When two protons repel each other we say that the _____ is working
    Electrical force.
  10. Can be used besides uranium to make atomic bombs and nuclear power plant fuel.
  11. Happens when two small atoms collide and combine to become a bigger atom.
  12. Democritus
    Democritus came up with the idea that all matter contains atoms. He reasoned that atoms were the smallest part of matter, and could not be broken down further.
  13. Dalton
    John Dalton was one of the first to develop an atomic model. He thought that the atom was the smallest possible component of matter.
  14. J.J. Thompson
    Discovered the electron.
  15. Rutherford
    Found the atom.
  16. Law of conservation of mass
    a fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system
  17. What is made in the upper atmosphere when a neutron collides with a nitrogen atom.
    Carbon 14
  18. Consists of two protons and two neutrons.
    Alpha Particle
  19. Two of these combine with an alpha particle to make helium gas.
  20. The amount of a fissionable material that it takes to get a chain reaction going.
    Critical mass
  21. Can go through paper but can be stopped by aluminum foil or thin glass
    Beta Particle
  22. Can be stopped by a piece of paper.
    Nuclear force